Alternative potential connections:

1. There are 27 member countries in the EU.

2. Black triangle in context of pharma: A black triangle is assigned to any new medicine when approved for the first time if it contains a new active substance, or is a biological medicinal product such as plasma derived medicines, vaccines or biosimilars .

3. Black triangle: Nazi marking of prisoners in concentration camps. Black triangles marked “asocial” prisoners (Asoziale - Aso), imprisoned in theory for vagrancy or prostitution, but in fact for a wide range of other deeds or behaviors, loosely and arbitrarily interpreted by the police. The Roma in the Birkenau “Gypsy camp” were classified as asocial.

4. Black triangle: Region in Eastern Europe/80's with very high levels of pollution.